Abstract
Water purification characteristics and attraction effect of aquatic animals in floating type edible aquatic plant purification system (FEAPPS) were investigated. FEAPPS is one of the ecological engineering techniques, where aquatic plants were set to raft floating on water and their roots were suspended below the surface of water. The concentration of SS and turbidity in FEAPPS in each state of eutrophic level was lower than that in control system because the existence of aquatic plant benefits the SS and turbidity removal in FEAPPS due to filter effects of the root. The average of crustacean biomass and transparency in FEAPPS was higher than that in control system and mutual relationship between these values was very high. It reveals that the application of FEAPPS contributes to keeping the amount of large crustacean as filter feeder, and high transparency can be attained in the system.
